I don't know what it is, but I've had SO MANY of the Paragon 8145 series die on my over the last 4 years. They used to last decades, but I've been going back lately and replacing ones that say like 2019, and 2020 on them. One freezer, the plastic arm broke off so it was keeping the defrost heaters energized all the time! Luckily, this was a blast freezer so the condensing unit was trying to keep up, but the restaurant called me because the freezer was only maintaining like +10 degrees and it should have been -10 to -15. All the other failures have been the damn timer motor just gets noisy then stops working. Usually, when it goes into defrost for a final time and then the motor dies, and it never comes out of defrost. 1 or 2 of them, it got weak and jammed up against the pin, and never could get it to cam over into defrost, those are always the fun ones, that turn the evap into a giant ice ball. What I usually do with those those though is just manually turn it into defrost. And then make a run to the supply house to get a new timer, and by the time I get back the ice monster is usually melted enough I can get the rest with a hose and hot water. I might start using those Grasslin's, I've only had to replace like maybe less than 5 of those over the last 6 years. One was like the original on a Trenton freezer condensing unit from back when the building was an old Pizza Hut from the early 2000's. 15 year old Grasslin! I've just been lazy, it's too easy with the Paragon to just go buy whatever voltage (120 or 208/240) guts you need and it's literally one screw and a couple of studs and pop the old Paragon guts out and swap it. I think however after all these time clock failures it's time to move on from Paragon. Yet another USA company that's cutting costs and making junk these days.
That poor opto-isolator still hasn't found what it's looking for. Shawn, why don't you use the board of the busticated timer, remove the mechanical timer, and use it as the base of an electronic relay timer. Might be a fun project.
I don't think I've touched one since this video 4 years ago. Basically these duplicate the old Paragon defrost clock wiring. And it varies on application. But essentially when the timer starts a defrost the fan stops, the heaters are energized (if used) on terminalm4 I believe. The compressor on terminal 3 is stopped. A defrost switch in the coil section will put power to X when it warms up when done defrosting. X will terminate defrost and the clock resumes the compressor. The amount of time is a "fail safe" which is maximum defrost time. Usually 45 min or so. The coils usually warm and terminate via the coil sensor and X earlier than the max fail safe time. I might be remembering some of that wrong. So check diagrams for PARAGON DEFROST CLOCK and look at those.
@@hackfreehvac What is the purpose of that F (Fan) terminal? That's one thing I never bothered to figure out. I suppose it's the same as the number 4 terminal, but like even on the OEM circuit schematic of a condensing unit that came factory with a Grasslin timer, they don't even show the F(fan) terminal at all since they don't even use it.
@@hackfreehvac It's gotten old then, new ones move quite freely, but yeah I've had to do that on older Grasslins, by using like a pen or something to spin the minute hand around, I didn't want to try and force the dial and break it when I didn't have a spare one, and it's the weekend... lol!
